http: Implement trailing headers for chunked transfers

This adds the CURLOPT_TRAILERDATA and CURLOPT_TRAILERFUNCTION
options that allow a callback based approach to sending trailing headers
with chunked transfers.

The test server (sws) was updated to take into account the detection of the
end of transfer in the case of trailing headers presence.

Test 1591 checks that trailing headers can be sent using libcurl.

Closes #3350
This commit is contained in:
Ayoub Boudhar 2018-12-06 10:18:03 +01:00 committed by Daniel Stenberg
parent 4531b299cc
commit f464535bfd
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17 changed files with 618 additions and 22 deletions

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@ -2636,6 +2636,16 @@ CURLcode Curl_vsetopt(struct Curl_easy *data, CURLoption option,
return CURLE_BAD_FUNCTION_ARGUMENT;
data->set.upkeep_interval_ms = arg;
break;
case CURLOPT_TRAILERFUNCTION:
#ifndef CURL_DISABLE_HTTP
data->set.trailer_callback = va_arg(param, curl_trailer_callback);
#endif
break;
case CURLOPT_TRAILERDATA:
#ifndef CURL_DISABLE_HTTP
data->set.trailer_data = va_arg(param, void *);
#endif
break;
default:
/* unknown tag and its companion, just ignore: */
result = CURLE_UNKNOWN_OPTION;